getusershell, setusershell, endusershell - get permitted user shells
#include <unistd.h>
char *getusershell(void);
void setusershell(void);
void endusershell(void);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
getusershell(), setusershell(), endusershell():
Since glibc 2.21:
_DEFAULT_SOURCE
In glibc 2.19 and 2.20:
_DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
Up to and including glibc 2.19:
_BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
The getusershell() function returns the next line
from the file /etc/shells
, opening the file if necessary. The
line should contain the pathname of a valid user shell. If
/etc/shells
does not exist or is unreadable,
getusershell() behaves as if /bin/sh
and
/bin/csh
were listed in the file.
The setusershell() function rewinds
/etc/shells
.
The endusershell() function closes
/etc/shells
.
The getusershell() function returns NULL on end-of-file.
/etc/shells
For an explanation of the terms used in this section, see attributes(7).
Interface | Attribute | Value |
getusershell(),
setusershell(), endusershell() |
Thread safety | MT-Unsafe |
4.3BSD.
shells(5)
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